I'm using them in my Ripley AR5s/23" barrel which I've set at 1000 FPS; trajectory is very flat and they are a little more resistant to wind drift than the 16 grainers, I like them. Effectively similar to my rimfire MV at 1080 FPS. I find Daystate heavies to be the same. I had a fluke shot recently, two rabbits, one shot, first time with an air rifle. As for the cons, I don't have any but I can easily adjust the MV on the Ripley to whatever I need. Brian